激光陀螺的高频读出与自适应滤波方法的研究

针对三轴激光陀螺捷联惯导系统(LINS)中三个激光陀螺受各自抖动频率限制,读出频带不足且读出信号不同步,导致动态应用精度降低,研究并开发了一种新的环形激光陀螺(RLG)高频读出电路及信号处理方法。方案采用抖动角传感器获取RLG抖动输出结合原始输出信号构成闭环LMS自适应滤波器,通过DSP信号处理,同时用整周期采样的累积输出作补偿。给出了实现的原理框图和滤波算法。经测试,该方法提高了RLG的读出频带,解决了读出信号不同步的问题,并有效减小了RLG的输出信号噪声,提高了LINS的解算精度,为系统在高动态条件下,实现相关数据分析与误差补偿提供了前提和基础。

Studying of the High Frequency Readout and Processing Method for Laser Gyro

Aimed at the falling of the dynamic precision and the readout bandwidth limited by the ring laser gyro's(RLG) dither in laser inertial navigation system(LINS),we studied and developed a new high frequency readout circuit and signal processing method,adapted the output of the RLG's dither-angle sensor,the RLG's output and the full-period sampling signal and constructed a closed loop LMS adapted filter.This paper gived the diagram and the arithmetic.Tests showed that the method has quite improved the readout bandwidth,solved the asynchronous problem of the readout signal and effectively reduced the output noise,improved the LINS's calculating precision.It's also the base to realize relevant analysis and compensations in system under high dynamic conditions.